Aimtech saddle mount mossberg 500/590 12ga.Black matte FEATURES:-For Mossberg 500/590 12 gauge-Black matte-No gunsmithing needed-Installs in minutes-Function is far superior to single sided "plate" mounts-Eye pleasing satin finish that won't shine and scare game-A true Aimtech "first", copied but never improved upon Other Features: Inverted vee-way centers the mount over the receiver & peaks high enough for bead sight to be used,installs in minutes w/provided screws